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problems with these,if you switch from cool to heat its trips the reset.....reason being if theres condensation on the heat strips which are about a inch from the evaporater coil..would have to let it dry up before heat will start....these are 39 brand new carriers,very nice units but everything is all over itself

well the only reason we found this was during the air balance,when they were checking both heat and cool...the thing about it is its a assissted living[old folks home]with their own rooms,so if they switch it the wrong way it is going to trip the gfi plug in...carrier said 9 times out of 10 its improper ground that trips it when you switch to heat...well heres 1 out of the 1o that doesnt apply....only way i can think of to stop that would be run the fan only till it drys up.....i just foresee callbacks,but i like this ptac system with duct kit...and your right most people dont switch it straight from heat to cool ...but we are dealing with old people here and the duct system covers part of the control panel so it would be hard for them to see the direction to turn the switch

use a

use an adjustable time delay on the heat strip relay. delay on make is what you want. make sure your t-stat is the type that calls for the fan when switched in to heating. remove the jumper wire that provides power to fan via the normally closed set of contacts on the fan relay. only wire going from heat relay to fan relay, attached to n.c. spade. - do this to avoid possibility of operating the fan on 2 separate speed taps. ex. - may run in high speed in cooling mode, but uses medium or low speed for heating. motor operating on 2 speeds at the same time will over-heat motor and shut down.